Articles | Volume 27, issue 6
Ann. Geophys., 27, 2555–2563, 2009
https://doi.org/10.5194/angeo-27-2555-2009

Special issue: 12th International Symposium on Equatorial Aeronomy...

Ann. Geophys., 27, 2555–2563, 2009
https://doi.org/10.5194/angeo-27-2555-2009

  24 Jun 2009

24 Jun 2009

Semidiurnal tidal signature in sporadic E occurrence rates derived from GPS radio occultation measurements at higher midlatitudes

C. Arras1, C. Jacobi2, and J. Wickert1 C. Arras et al.
  • 1Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Department 1: Geodesy and Remote Sensing, Germany
  • 2University of Leipzig, Institute for Meteorology, Germany

Abstract. GPS (Global Positioning System) Radio occultation (RO) measurements from CHAMP, GRACE and FORMOSAT-3/COSMIC satellites at Northern Hemisphere midlatitides (50°–55° N) are analysed to obtain the diurnal variation of sporadic E layer occurrence frequency in 2006 and 2007. Interconnections with zonal wind shears measured by meteor radar at Collm (51.3° N, 13° E), Germany, are investigated. According to theory, maximum Es occurrence is expected when the zonal wind shear, which is mainly produced by the semidiurnal tide in midlatitudes, is negative. This is confirmed by the present measurements and analysis.